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Railways Sample Paper RRB (Group D) Sample Test Paper-11

  • question_answer
    The metal ion present in vitamin \[{{B}_{12}}\]is

    A)  Nickel  

    B)  cobalt

    C)  Iron                 

    D)  zinc

    Correct Answer: B

    Solution :

    [b] Vitamin B12 consists of a class of chemically related compounds (vitamers). It contains the biochemically rare element cobalt.


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